B) Display Symbols; C) Button Functions; Setup; A) Installing/Replacing The Battery - VOLTCRAFT GM-70 Operating Instructions Manual

b) Display symbols

G Gauss, natural unit of magnetic flux density
mT Millitesla, SI unit of magnetic flux density
N Indicates a positive magnetic field (north pole with DC)
S Indicates a negative magnetic field (south pole with DC)
AC Indicates AC field mode
REC Indicates minimum/maximum value data recording
Max Indicates the maximum value
Min Indicates the minimum value
Low battery status symbol (battery required)

c) Button functions

• POWER button (2): Switches the measuring device on and off
• HOLD button (5): The measured values are frozen on the display when the HOLD button (5) is pressed
• REC button (6): The minimum/maximum values are saved when the button is pressed and each further press of the
button shows the minimum and maximum values in succession for 'REC'
• ZERO button (1): This button is used for zero adjustment.
• MODE - DC AC button (7): This button is used to switch between units of measurement and measuring modes
(DC and AC fields)

8. Setup

a) Installing/replacing the battery

Before initial operation of this measuring device, you must first install a 9 V block (alkaline) battery. A power adapter
can also be used (optional).
The battery must be inserted or replaced for initial operation or when the battery status symbol
Proceed as follows to replace the battery:
• Switch off the measuring device.
• Loosen the rear battery compartment screw (12) and carefully lift off the battery compartment cover (11).
• Connect a 9 V block battery with the battery connector. Pay attention to correct polarity (+/-) of the battery connector.
Stow both in the battery compartment.
• Close the battery compartment by carefully inserting and tightening the screw of the battery compartment cover.
• If you replace a flat battery with a new alkaline batteries of the same type, proceed in exactly the same way,
ensuring to remove the flat battery first.
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